First, she came across "The Conjuring" (2013), a classic horror movie based on the true story of paranormal investigators Ed and Lorraine Warren. The movie had received widespread critical acclaim and had been known to terrify audiences. She added it to her watchlist.
For the most up-to-date list, you can check the "Horror" category on Prime Video and look for the "Included with Prime" banner on movie thumbnails. scariest movies on prime free